Spray applicator

Abstract

A disposable spray applicator for liquid or pulverulent medicaments includes a receptacle containing the medicament and having one or more dosing chambers and is provided with a piston plug at one end, and a spray head with corresponding cap at the other end. The spray head surrounds the rim of the receptacle and is held in place by an annular sealing torus. The spray head is provided with a rectangular outlet canal, through which the medicament is sprayed at a right angle into a turbulence chamber formed by a spraying nozzle, and from there to the outside. The sealing torus has an annular groove on the surface of the receptacle facing the spray head, and an annular bead on the opposite, i.e. interior, surface. The bead mates with a correspondong groove on the piston plug to stop the action of the spray applicator when the plug has moved a distance corresponding to a measured dosage.

What is claimed is: 
     
       1. A disposable spray applicator for liquid or pulverulent medicaments comprising a receptacle cylinder divided axially into one or more dosing chambers, a piston plug disposed in said receptacle cylinder, spray head means disposed at one end of said receptacle cylinder, the spray head means surrounding the cylinder at said one end and having sealing means disposed therein sealably contacting the one end of the receptacle cylinder, and nozzle means connecting to the outside; at least one annular torus girdling said receptacle cylinder to divide the same into said dosing chambers and having an inner torus face and an outer torus face on the interior and exterior sides of said receptacle cylinder, respectively; at least one mating torus in said piston plug to catch said inner torus face at the end of a predetermined dosage; and at least one mating torus in said spray head means mating with said outer torus face to ensure that the receptacle cylinder, when inserted into said spray head means, is secured therein. 
     
     
       2. The spray applicator as claimed in claim 1, wherein the size of the dosing chambers is determined by axial separation of the annular tori. 
     
     
       3. The spray applicator as claimed in claim 1, wherein said spray head means is provided with an overfitting cap having at least one cam disposed therein, and said spray head means has a corresponding groove thereon, so that said cap is held in place over said spray head means by said cam taught in said groove. 
     
     
       4. The spray applicator as claimed in claim 3, wherein said cap further includes a sealing cone disposed surrounding said nozzle means when the cap is in place on said spray head means. 
     
     
       5. The spray applicator as claimed in claim 1, wherein said nozzle means includes a spraying nozzle having an outlet, and a turbulence chamber connected therewith, and a rectangular outlet canal through which the medicament is sprayed into the turbulence chamber.